<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcss.com/jquery/1.11.3/jquery.js"></script>
</head>
<body>
<script>
$.getJSON('json1.json',function(data){

    //原始数据
    console.log(data);

    //采用filter过滤
    data.image_size_list = data.image_size_list.filter(function(item){
        return item.ad_class=='N' || item.ad_class=='C';
    });
    console.log(data);
})
</script>
</body>
</html>